USB wall charger



FIG. 1 is a front view of a USB wall charger showing my new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is another front view thereof;

FIG. 4 is another front perspective view thereof;

FIG. 5 is a side view thereof;

FIG. 6 is a back view thereof;

FIG. 7 is another front view thereof; and,

FIG. 8 is another front perspective view thereof.

The broken lines shown represent unclaimed subject matter and form no part of the claimed design. 

CLAIM I claim the ornamental design for a USB wall charger, substantially as shown and described. 